Sealing structure for shaft seal of turboset

Abstract

The utility model belongs to the technical field of shaft seal sealing, and particularly relates to a steam turbine unit shaft seal sealing structure which comprises a shaft rod body and a sealing shaft sleeve arranged on the shaft rod body in a sleeved mode, and a movable sealing ring and a static sealing ring are arranged between the sealing shaft sleeve and the shaft rod body from inside to outside. The movable sealing ring comprises a plurality of inner sealing rings which are arranged in a stacked manner; the inlet sealing ring comprises a plurality of outer sealing rings which are arranged in a stacked mode, the outer sealing rings and the inner sealing rings are distributed in a staggered mode, and the end portions of the adjacent inner sealing rings and the end portions of the adjacent outer sealing rings horizontally extend to form sealing rings; according to the utility model, the plurality of outer sealing rings and the plurality of inner sealing rings which can be overlapped are additionally arranged, so that the labyrinth sealing channels are formed between the adjacent outer sealing rings and inner sealing rings, and the labyrinth sealing channels are buckled, so that the sealing gaps are hidden, the medium circulation is further reduced, and the sealing effect of equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of shaft seals, and in particular relates to a shaft seal structure for a steam turbine unit. Background Art

[0002] The shaft seal structure is required when assembling the turbine unit shaft. The shaft seal structure is a device used to prevent fluid leakage and is mainly composed of a shaft sleeve, a stuffing box, stuffing, a water seal and other parts.

[0003] Most shaft seal structures use comb-tooth labyrinth seals. Comb-tooth seals are non-contact seals with sealing gaps, which inevitably lead to shaft end leakage. Utility Model Content

[0004] The purpose of the utility model is to provide a steam turbine unit shaft seal structure to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a steam turbine shaft seal structure, comprising: a shaft body and a sealing sleeve sleeved on the shaft body, wherein a dynamic sealing ring and a static sealing ring are provided between the sealing sleeve and the shaft body from the inside to the outside;

[0006] A dynamic sealing ring, comprising a plurality of inner sealing rings arranged in a stacked manner;

[0007] Static sealing ring, the inlet sealing ring includes a plurality of superimposed outer sealing rings, the plurality of outer sealing rings and the plurality of inner sealing rings are staggered, the ends of adjacent inner sealing rings and adjacent outer sealing rings are horizontally extended with sealing rings, and the two sealing rings are respectively abutted on the outer walls of the inner sealing ring and the outer sealing ring, and a labyrinth seal for sealing is formed between the two sealing rings.

[0008] Preferably, multiple outer sealing rings and multiple inner sealing rings are provided with multiple connecting bolts for connection, and multiple outer sealing rings and multiple inner sealing rings are penetrated by multiple mounting holes for accommodating connecting bolts, and both ends of each connecting bolt are threaded with nuts embedded in the corresponding mounting holes.

[0009] Preferably, an abutment groove for accommodating multiple inner sealing rings is provided on the inner wall of the sealing sleeve, a plug extending into the abutment groove is provided at the end of the sealing sleeve, and an internal thread groove connected to the plug is provided on the inner side of the port of the abutment groove.

[0010] Preferably, a limiting column for limiting position is further provided on the inner side of the plug, and the limiting column abuts against the end of the sealing sleeve.

[0011] Preferably, a first positioning column for positioning the inner sealing ring is further provided at the end of the abutting groove, and a first positioning hole for accommodating the insertion of the first positioning column is opened at the end of one of the inner sealing rings.

[0012] Preferably, a retaining ring is welded on the outer periphery of the shaft body, and a second positioning column for positioning the outer sealing ring is provided on one side of the retaining ring, and a second positioning hole for accommodating the insertion of the second positioning column is opened at one end of the outer sealing ring.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The utility model forms a labyrinth seal between adjacent outer sealing rings and inner sealing rings by adding multiple stackable outer sealing rings and multiple inner sealing rings, and the labyrinth seal is a snap-fit ​​type, thereby hiding the sealing gap, further reducing the medium circulation, and improving the sealing effect of the equipment.

[0015] (2) The utility model adds a plurality of connecting bolts, through which a plurality of outer sealing rings and a plurality of inner sealing rings can be connected, thereby facilitating the rapid disassembly and assembly of the dynamic sealing ring and the static sealing ring, and facilitating subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 This is a three-dimensional diagram of the dynamic sealing ring of the utility model;

[0018] Figure 3 This is a three-dimensional diagram of the static sealing ring of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the outer sealing ring, inner sealing ring and connecting bolts of the utility model;

[0020] Figure 5 A three-dimensional diagram of the plug of the utility model;

[0021] In the figure: 1. Shaft body; 2. Plug; 3. Limiting column; 4. Internal thread groove; 5. Abutment groove; 6. Sealing sleeve; 7. Static sealing ring; 8. First positioning hole; 9. First positioning column; 10. Inner sealing ring; 11. Outer sealing ring; 12. Second positioning column; 13. Second positioning hole; 14. Dynamic sealing ring; 15. Retaining ring; 16. Mounting hole; 17. Connecting bolt; 18. Nut. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] refer to Figure 1-3 As shown, the utility model provides a steam turbine unit shaft seal structure, comprising: a shaft body 1 and a sealing sleeve 6 sleeved on the shaft body 1, with a dynamic seal ring 14 and a static seal ring 7 arranged between the sealing sleeve 6 and the shaft body 1 from the inside to the outside;

[0024] A dynamic sealing ring 14, which includes a plurality of inner sealing rings 10 arranged in a stacked manner;

[0025] The static sealing ring 7 and the inlet sealing ring include multiple superimposed outer sealing rings 11. The multiple outer sealing rings 11 and the multiple inner sealing rings 10 are staggered. The ends of adjacent inner sealing rings 10 and adjacent outer sealing rings 11 are horizontally extended with sealing rings, and the two sealing rings are respectively abutted on the outer walls of the inner sealing ring 10 and the outer sealing ring 11, and a labyrinth seal for sealing is formed between the two sealing rings.

[0026] As described above, when using the sealing sleeve 6, shaft body 1, dynamic sealing ring 14 and static sealing ring 7 provided by the present invention, the dynamic sealing ring 14 and the static sealing ring 7 form a bite-type sealing structure through multiple outer sealing rings 11 and multiple inner sealing rings 10, thereby hiding the labyrinth seal between the dynamic sealing ring 14 and the static sealing ring 7, further reducing the medium circulation and improving the sealing effect of the equipment.

[0027] In this utility model, combined with Figure 2-4 As shown, the multiple outer sealing rings 11 and the multiple inner sealing rings 10 of this embodiment are provided with multiple connecting bolts 17 for connection, and the multiple outer sealing rings 11 and the multiple inner sealing rings 10 are penetrated by multiple mounting holes 16 for accommodating the connecting bolts 17, and both ends of each connecting bolt 17 are threaded with nuts 18 embedded in the corresponding mounting holes 16.

[0028] As described above, when using the connecting bolts 17 provided by the present invention, after multiple outer sealing rings 11 and multiple inner sealing rings 10 are staggered and stacked in sequence, the mounting holes 16 on the multiple outer sealing rings 11 and the multiple inner sealing rings 10 are aligned, and the multiple connecting bolts 17 are passed through the corresponding mounting holes 16 in sequence, and the nuts 18 are installed at both ends of the connecting bolts 17. At this time, the dynamic sealing ring 14 and the static sealing ring 7 are formed to be engaged. The static sealing ring 7 and the dynamic sealing ring 14 can only be disassembled and assembled after the connecting bolts 17 are removed.

[0029] Further, in order to facilitate the installation of the static seal ring 7 on the sealing sleeve 6, refer to Figure 1 As shown, the inner wall of the sealing sleeve 6 is provided with an abutment groove 5 for accommodating multiple inner sealing rings 10. The end of the sealing sleeve 6 is provided with a plug 2 extending into the abutment groove 5. The inner side of the end of the abutment groove 5 is provided with an internal thread groove 4 connected to the plug 2. The end of the abutment groove 5 is also provided with a first positioning post 9 for positioning the inner sealing ring 10. The end of one of the inner sealing rings 10 is provided with a first positioning hole 8 for accommodating the insertion of the first positioning post 9. After the multiple inner sealing rings 10 on the static sealing ring 7 are all sleeved on the shaft body 1, the first positioning post 9 on one of the inner sealing rings 10 is allowed to dock with the first positioning hole 8 on the abutment groove 5. At this time, the static sealing ring 7 can be installed on the inner wall of the sealing sleeve 6.

[0030] Furthermore, in order to facilitate the positioning of the maze-type road closure gap, refer to Figure 1 and Figure 5 As shown, a limiting post 3 for limiting position is further provided on the inner side of the plug 2, and the limiting post 3 abuts the end of the sealing sleeve 6. The plug 2 is screwed into the abutment groove 5 through the internal thread groove 4. When one end of the plug 2 abuts the dynamic seal ring 14, the dynamic seal ring 14 and the static seal ring 7 are confined in the abutment groove 5. When the limiting post 3 on the plug 2 abuts the sealing sleeve 6, it limits the plug 2 from excessively abutting the dynamic seal ring 14, thus preventing the labyrinth seal gap from being too small.

[0031] Further, in order to facilitate the installation of the dynamic seal ring 14 on the shaft body 1, refer to Figure 1 As shown, a retaining ring 15 is welded to the outer circumference of the shaft body 1. A second positioning post 12 is provided on one side of the retaining ring 15 for positioning the outer sealing ring 11. A second positioning hole 13 is formed at the end of one of the outer sealing rings 11 to accommodate the insertion of the second positioning post 12. After the multiple outer sealing rings 11 on the dynamic sealing ring 14 are sleeved onto the shaft body 1, the second positioning post 12 on one of the outer sealing rings 11 is aligned with the second positioning hole 13 on the retaining ring 15. At this point, the dynamic sealing ring 14 can be installed on the shaft body 1.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam turbine shaft seal structure, characterized in that: include: A shaft body (1) and a sealing sleeve (6) sleeved on the shaft body (1), wherein a dynamic sealing ring (14) and a static sealing ring (7) are provided between the sealing sleeve (6) and the shaft body (1) from the inside to the outside; A dynamic sealing ring (14), the dynamic sealing ring (14) comprising a plurality of inner sealing rings (10) stacked together; A static sealing ring (7), wherein the inner sealing ring comprises a plurality of superimposed outer sealing rings (11), the plurality of outer sealing rings (11) and the plurality of inner sealing rings (10) are staggered, the ends of adjacent inner sealing rings (10) and adjacent outer sealing rings (11) are horizontally extended with sealing rings, and the two sealing rings are respectively abutted against the outer walls of the inner sealing ring (10) and the outer sealing ring (11), and a labyrinth seal for sealing is formed between the two sealing rings.

2. The steam turbine shaft seal structure according to claim 1, characterized in that: The plurality of outer sealing rings (11) and the plurality of inner sealing rings (10) are each provided with a plurality of connecting bolts (17) for connection, and the plurality of outer sealing rings (11) and the plurality of inner sealing rings (10) are each penetrated by a plurality of mounting holes (16) for accommodating the connecting bolts (17).

3. The steam turbine shaft seal structure according to claim 2, characterized in that: Both ends of each connecting bolt (17) are threadedly connected with nuts (18) embedded in corresponding mounting holes (16).

4. The steam turbine shaft seal structure according to claim 1, characterized in that: An abutment groove (5) for accommodating a plurality of inner sealing rings (10) is provided on the inner wall of the sealing sleeve (6), and a plug (2) extending into the abutment groove (5) is provided at the end of the sealing sleeve (6).

5. The steam turbine shaft seal structure according to claim 4, characterized in that: An internal thread groove (4) connected to the plug (2) is provided on the inner side of the port of the abutment groove (5).

6. The steam turbine unit shaft seal structure according to claim 4, characterized in that: A limiting column (3) for limiting position is also provided on the inner side of the plug (2), and the limiting column (3) abuts against the end of the sealing sleeve (6).

7. The steam turbine shaft seal structure according to claim 4, characterized in that: The end of the abutment groove (5) is also provided with a first positioning column (9) for positioning the inner sealing ring (10), and one end of the inner sealing ring (10) is provided with a first positioning hole (8) for accommodating the insertion of the first positioning column (9).

8. The steam turbine shaft seal structure according to claim 1, characterized in that: A retaining ring (15) is welded on the outer periphery of the shaft body (1), and a second positioning column (12) for positioning the outer sealing ring (11) is provided on one side of the retaining ring (15).

9. The steam turbine shaft seal structure according to claim 8, characterized in that: A second positioning hole (13) for accommodating the insertion of a second positioning column (12) is provided at the end of one of the outer sealing rings (11).

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